After a few days wading through a lot of total overkill, I found
   this. Like #happywheels ? Well this does the same #physics but
   you can really make and control stuff. It's what I was looking
   for - and to think I downloaded one CAD program after another...
   looked at programming hooks and things... but all I wanted to be
   able to do is draw easily and animate how it works. This does it
   - and its fun.